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                <a name="asio.reference.basic_waitable_timer.expires_at.overload2"></a><a class="link"
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                                                                                          title="basic_waitable_timer::expires_at (2 of 3 overloads)">basic_waitable_timer::expires_at
                (2 of 3 overloads)</a>
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    <p>
        Set the timer's expiry time as an absolute time.
    </p>
    <pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span
            class="identifier">size_t</span> <span class="identifier">expires_at</span><span class="special">(</span>
    <span class="keyword">const</span> <span class="identifier">time_point</span> <span
                class="special">&amp;</span> <span class="identifier">expiry_time</span><span class="special">);</span>
</pre>
    <p>
        This function sets the expiry time. Any pending asynchronous wait operations
        will be cancelled. The handler for each cancelled operation will be invoked
        with the <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span
            class="identifier">error</span><span class="special">::</span><span
            class="identifier">operation_aborted</span></code> error code.
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    <h6>
        <a name="asio.reference.basic_waitable_timer.expires_at.overload2.h0"></a>
        <span><a name="asio.reference.basic_waitable_timer.expires_at.overload2.parameters"></a></span><a class="link"
                                                                                                          href="overload2.html#asio.reference.basic_waitable_timer.expires_at.overload2.parameters">Parameters</a>
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        <p class="title"><b></b></p>
        <dl>
            <dt><span class="term">expiry_time</span></dt>
            <dd><p>
                The expiry time to be used for the timer.
            </p></dd>
        </dl>
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    <h6>
        <a name="asio.reference.basic_waitable_timer.expires_at.overload2.h1"></a>
        <span><a name="asio.reference.basic_waitable_timer.expires_at.overload2.return_value"></a></span><a class="link"
                                                                                                            href="overload2.html#asio.reference.basic_waitable_timer.expires_at.overload2.return_value">Return
        Value</a>
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    <p>
        The number of asynchronous operations that were cancelled.
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    <h6>
        <a name="asio.reference.basic_waitable_timer.expires_at.overload2.h2"></a>
        <span><a name="asio.reference.basic_waitable_timer.expires_at.overload2.exceptions"></a></span><a class="link"
                                                                                                          href="overload2.html#asio.reference.basic_waitable_timer.expires_at.overload2.exceptions">Exceptions</a>
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        <p class="title"><b></b></p>
        <dl>
            <dt><span class="term">asio::system_error</span></dt>
            <dd><p>
                Thrown on failure.
            </p></dd>
        </dl>
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        <a name="asio.reference.basic_waitable_timer.expires_at.overload2.h3"></a>
        <span><a name="asio.reference.basic_waitable_timer.expires_at.overload2.remarks"></a></span><a class="link"
                                                                                                       href="overload2.html#asio.reference.basic_waitable_timer.expires_at.overload2.remarks">Remarks</a>
    </h6>
    <p>
        If the timer has already expired when <code class="computeroutput"><span
            class="identifier">expires_at</span><span class="special">()</span></code> is called, then the handlers for
        asynchronous
        wait operations will:
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            <li class="listitem">
                have already been invoked; or
            </li>
            <li class="listitem">
                have been queued for invocation in the near future.
            </li>
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    <p>
        These handlers can no longer be cancelled, and therefore are passed an
        error code that indicates the successful completion of the wait operation.
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